Display-light.



No. 705,426. Patented July 22, I902;

0. 'A. MYGATT.

DISPLAY LIGHT.

I (Application flleri Mar. 7, 1901.\

(No Model.)

gvwem roz 61 Home/1 UNITED STATES PATENT OFFICE.

OTIS A. MYGATT, OF NEl V YORK, N. Y.

DISPLAY-LIGHT.

SPECIFICATION forming part'of Letters Patent No. 705,426, dated July 22, 1902.

Application filed March '7, 190L. Serial No. 60,236. (No model.)

T0 at whont it nwty concern.-

Be it known that I, OTIS A. MYGATT, residing at New York, in the county of New York p and State of New York, have invented certain new and useful Improvements in Display- Lights, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to display-lights for decorative effects.

The object of the invention is to produce, by a combination of colored layers permeable to light and reflectors having a number of reflecting angles or facets, an iridescent light having a kaleidoscopic effect useful for decorative purposes. 1

Figure lis a section of an illuminator arranged "according to my invention. Fig. 2 is a side elevation of a colored covering applicable to a lamp. Figs. 3 and 4 are similar views of modifications. Fig. 5 is an elevation of a transparent frustum having prismatic reflecting-surfaces. Fig. tlisabroken sectional perspective of the same on lines 6 6, Fig. 5.v

A truncated frustum of transparent glass having smooth inner surface and having facets of geometrical or other regular patterns pressed in or on the material of the glass and.

on the upper-surface acts as a reflector by throwing back the light-rays from the inner faces of the projections, facets, or patterns on the glass. These must of necessity be at various angles to the source of light, and hence act as prisms to change direction of the light-rays reaching such surfaces from inside the frus-' tum. Ribs or prisms pressed on the upper sur face of the shade, so that rays passing through the glass will strike the inner surface of the outer facet at an angle of forty-five degrees, will cause the rays to be turned almost ontirely at an angle of ninety degrees. across the facet or rib. Here, again, the light-ray, if itencounters the inner plane of the facet at an angle of forty-five degrees, will be again deflected ninety degrees and thrown back in a line parallel with the original line of radiation. As much as eighty-five per cent. of

the light may thus be reflected by ribs on the outer surface of transparent glass, leaving but about fifteen per cent. of the light to part of an electric-lamp bulb.

pass through the glass. The amount of light so reflectedthat is, twice deflected ninety degreesis much reduced, as the angle varies from forty-five degrees; but by covering the entire upper surface of a transparent shade with ribs or prisms arranged at the proper angle I am able to reflect or throw back nearly as much light as from a silvered mirror.

Let Z Z represent such a reflector placed in usual relation to an electric or similar lampY. Then over the lamp Y, I arrange a cup or cover of party-colored glass, as indicated at X. The colored cover X may have as many colors and may be arranged in as many patterns as desirable. The glass should be as transparent as may be consistent with maintaining its colors or tints.

Colored cups X may be made by painting with transparent colors on the bulb and then burning, or the stratum of colored glass may be applied to the surface of an ordinary lamp-bulb, or transparent colors may other Wise be applied, as in the glass of the lamp itself; but as cups are of slight cost it is better to have them made removable, when by changing the cups diiferent decorative effects may be produced with the same light. The removable cups are made of thin glass of a form to fit neatlyover the stem or upper The removable cups are of 'frusto-conical or bell form, open at both top and bottom.

As the light from lamp Y passes through all parts of the cup X, it is evident that rays from more than one of the colored portions will be likely to strike the inclined reflectingsurfaces of the upper face of the reflector Z. As the angles of the reflecting-faces vary, the result is that the reflected light from these surfaces has a peculiar iridescent or prismatic rainbow effect.

If the cup X be made of glass of a single color or tint, the light passing through said cup will strike the inclined reflecting-surfaces at various angles and will still be defiected and an iridescent effect will be produced; but the prevailing color will be maintained, gradated into shades; but where a plurality of colors are used and more than one color is thrown onto an inclined illumiand an interposed stratum, permeable to light, and colored with a plurality of transparent colors.

3. The combination with afrustum of transparent glass having reflecting-facets on its outer face, of an inolosed artificial light, and a removable interposed cup of colored glass.

In testimony whereof I affix my signature in presence of two witnesses.

OTIS A. MYGATT.

Witnesses:

W. A. BARTLETT, HARVEY T. WINFIELD. 

